Snubbed truck



Jan. 10, 1956 w. L. SCHLEGEL, JR 2,730,049

SNUBBED TRUCK Filed Sept. 20, 1951 IN VEN TOR.

Zflllier L. Schlegle [,JL

United States Patent SNUBBED? WiilterL. .Schlfegel; Ji' Chicago; IILassig nor to A'm'erican" Steel Foundrig, (Bliicago, I112, acorporationof- Illihois' Application September-20,4951,Serial No.247,458-IZCIainIsL (Cl:- 105 197) This-invention. relates torailway cartruckstand more particularly to a truck in which novel frictionisnubbingmeansare provided for damping:verticaL-lateral and outofsquare'movements of a. truck-1 bolster. relative to i the supporting, sideframes.

Prior. art trucks of this typekh'ave ineorporatedfcomplicatedsnubbingdevicesinswhichia great number of parts have been required,resulting; inexpensive and complicated truck and snubbing parts. Some ofthese prior art devices have utilized: one or more shoes -=associatedwith each column. of I the trucks side: frames, .invcombination with.one or more shoe actuating; springs associated withii the shoe-or. shoesatieachscolumne Other snubbed trucks have. utilized. a plurality offrictions shoes associated with the sid'eframe-columns, .in combination.with one or more springs and actuating plates or Wedges fortransmitting. thrustof. the springs. to the shoes.

Accordingly, a. primaryobjectof. the ipresent'invention isLto-V devise anovel :snubbingqdeviceconsisting of three pansy-nam ly, 1W0 shoes andone actuating springdsoarranged. that the spring is effectiveto urgethe-shoesagainst. the respective columns. under. substantially con stantpressure during verticals oscillation of i thebolster.

on. its supporting springs Anothertobject of the inventiontisto devisearsnubbing" device such as above described, wherein th'e side frame may,be. ofstandard construction. and. thebolster may be of very simple formwithout the necessity of providing complicated wedge surfaces orfriction shoe. housings therein.

Another object of .the invention is to urgeithe friction shoes'undersubstantially constant pressure against..one.

of the top or bottom bolster walls to preventshoe chatter resultingfrom.relative vertical movement between the bolster and shoes under serviceconditions Another object ofthe invention is to prevent friction shoechatter resulting, from relative lateral; movement between the bolster.and'shoes under service conditions.

, The foregoing and other objects and advantages of the inventionWiIPbecOme'a parentJ fromra consideration of' the followingspecification and the accompanyi'ngdrawings, wherein: M

Figure 1 is a fragmentary, side elevational view of a freight cartruck"embodying a preferred 'form of the invention;

.Figure Zhis a top. planview off. the snubbing: device 2,730,049PatentedJanm 10, .1956a 2"? the'bolster opening 8-bysprings-diagrammatically:indicated at 14 and supported by a springseat-i16--on-the tension member 4 at the'bottomt of the bolster-openinggs.

As :will be readily understood by those-skilled in-the art, the bolster12, as shown in Figure a 3, extends trans-- versely of-the truckandprojects at each-endthereof-into: the bolster opening 8 of the.relatedt side frame for sup; port by' the spring 14 thereof.Inithe-drawings, only,- one end ofthe bolster and relatedside frame andsnub bing means-are illustrated inasmuch as the corresponding'structureat the opposite end of the bolster. ispreferably identical.

At each side thereof,,the bolster.istprovidedrwith inboard and outboardgibs 18 and 20'loosely confiningthe columns 6 to accommodate vertical,lateral and out-ofsquare movements of the bolster. 12 asare desirable.under variousconditionsof railway service. Between the gibs. 18and 20 atone side of the bolster, the latter is formed. with a transverse wallmember 22. whichv is preferably diagonal with respect to the vertical,,.as best seen in-:Eigure 3, for a purpose hereinafter. described.

The inboard side. of the wallmember 22 is frictionally, engaged with afriction shoe 25 alongcomplementary preferably flat Wedge faces of theshoe. and walllslopingfi downwardly and outboardly, asshownin Figure. 3.One. end of the shoe 25 is engaged with a friction surface 27 on therelated column 6, said friction surface preferably being providedon thewear plate. 28, attached. in any convenient manner to the column. Theopposite end. of the shoe 25 is formed with a wedge surface 301which',.as seen in the topplan view of Figure 2', is disposedldidg: onally withrespect to the longitudinal vertical center plane X-X of the bolster 12The wedge surface 30of the shoe 25 is engaged with a complementary wedgesurface 32 at the correspondingend of a friction shoe member 34, theopposite end of which is engaged with. a friction surface27on a wearplate 28 of the related column 26'.

Actuating means are provided for the shoe 25and shoe member 34' in theform of a compression coil spring di'agrammatically indicated at 36; Theinboard end ofsaid spring is compressed. against a bolster spring seatwallor lug 33, andthe outboard end of. the-spring'36" is com pressedagainst the inboard side of. the friction shoe member 34. Itmay benoted, as best seen in Figure3, that'the compressional axis ofthespringfislopes down wardly and outboardly toward the wallmember.22,1which ism-ranged in converging relationship'with respect tothe wall 38, whereby both" the shoe 25" and shoe member'3'4' aremaintained against vertical' chatter resulting from relative verticalmovement ofthe bolster 12; Thusit will be understoodthat thediagonalsloping arrangement of thespring 36 causes a verticalforce'component'on' the shoe'member 34 holding it tightly'againstthe'bottom wall ofthe bolster 12', said bottom wall extendinglongitudinally of the bolster'12 as will be understood'by thoseskilledin the art. The spring '36 is'also' effective tourge the shoemember 34outboardly into wedge engagement at 30; 32 with the frictionshoe 25 whereby"theshoe and shoe'member' are urged, respectively,againstthe related' colurn'n surfaces 271 It may also be noted, as bestseenin' Figure 2," thatthe" compressional axis of the spring,36 isdefined byaverti: cal'"plane"substantially parallel'to the plane and tothe-planes of the frictionsurfaces' 27 "whereby'a force" component ofthe spring 36 is afforded to urge the shoe 25 outboardly against thebolster wall member 22 which preferably slopes downwardly and outboardlythereby holding the shoe 25 against the bottom bolster wall preventingvertical chatter of the shoe 25.

Thus it will be understood that in the novel arrange ment abovedescribed, the shoe and shoe member are l f 2,730,049 r I I g Tpositively interlocked with the bolster against substantial relativemovement thereof, whereby vertical and lateral oscillations of thebolster and the springs 14 are snubbed by frictional engagement with thecolumn surfaces 27; and out-of-square bolster movements relative to theside frame are frictionally resisted by engagement of the shoe and shoemember with the bottom bolster wall.

An important feature of the invention resides in the arrangement ofparts which reduces the components of the snubbing device to a minimum,inasmuch as one spring 36 is sufficient to actuate both the shoe andshoe member under substantially constant pressure against the side framecolumns and against the bottom bolster wall. Although it Will beunderstood that, if desired, another spring 36 may be interposed betweenthe engaged faces of the shoe 2 5 and wall member 22 by positioning thewall member 22 at approximately the outboard end of the bolster 12.

I claim:

1. In a railway car truck, a side frame having spaced columns withsubstantially parallel, transverse friction surfaces, a bolsterspring-supported between said columns, said bolster having a wall memberextending transversely thereof toward one of the columns, a frictionshoe engaging said column and wall member, a friction shoe memberengaging the other column, said bolster having a bottom wall supportingsaid shoe member, spring means compressed between the bolster and theshoe member for urging the latter outboardly, said spring means havingits compressional axis extending downwardly and outboardly to hold saidshoe member tightly against said bottom wall, and interengaged wedgesurfaces on the inner ends .of said shoe and shoe member arrangeddiagonally with respect to said column surfaces, whereby said springurges said shoe against said wall memb r and urges said shoe and shoemember against the respective columns, and means on the shoe and wallmember for holding the shoe against the bolster wall.

2. A railway car truck according to claim 1, wherein the last mentionedmeans are characterized by interengagedsurfaces on the wall member andshoe sloping downwardly and outboardly lengthwise of the bolster.

3. In a railway car truck, a side frame comprising spaced columns havingtransverse friction surfaces disposed in approximately parallel planes,a bolster springsupported between said columns, friction shoes housedwithin the bolster in frictional engagement with respective surfaces,the longitudinal vertical center plane of the bolster beingapproximately parallel to the first mentioned planes, said bolsterhaving a transverse wall and a longitudinal wall, said friction shoeshaving complementary interengaged wedge surfaces arranged diagonallywith respect to said planes, and sloping spring means engaged with thebolster and one of the shoes for urging said one shoe against thelongitudinal wall and for urging said wedge surfaces into engagement andthereby urging said friction shoes against the respective columnsurfaces, and means on the transverse wall and other shoe for holdingthe latteragainst the longitudinal wall.

4. A railway car truck, according to claim 3, wherein 7 shoe slopinglengthwise of the bolster.

6. A railway car truck, according to claim 3, wherein the spring meansare characterized by a compression spring compressed-between the bolsterand one of the shoes on an axis falling within a vertical plane parallelto the longitudinal, vertical .center plane of the bolster.

7. In a railway car truck, a frame member having spaced frictionsurfaces, a bolster member movable with respect to said surfaces, and afriction device carried by the bolster member comprising a shoe and ashoe member engaged with respective surfaces, said shoe and shoe memberhaving interengaged wedge faces diagonal with respect to said surfaces,and sloping spring means compressed between the bolster and the shoemember for urging said wedge faces into engagement and for urging saidshoe member into contact with a substantially horizontal surface of thebolster member, and means on the shoe and on the bolster member'forholding the shoe against said substantially horizontal surface.

8. A railway car truck, according to claim 7, wherein the wedge facesare vertical, and the last mentioned means are characterized byinterengaged surfaces: of the shoe and bolster member slopinglongitudinally'of the bolster member. V

9. In a railway car truck, a side frame, a bolster springsupportedthereby, and friction means for damping oscillations of the bolstercomprising spaced friction surfaces carried by the frame, friction shoesengaged with respective surfaces and having directly interengaged wedgesuring spring means for urging the wedge surfacesinto' engagement with'eachother whereby the shoes are engaged with respective frictionsurfaces, said spring means being operative to limit relative verticalmovement of one of the shoes with respect to the bolster, and independent means associated with the other shoe' for limiting relativevertical movement of the bolster with respect thereto. e m

10. A railway car truck having spaced columns, a bolster therebetween,and friction means for controlling bolster oscillations comprisingfriction shoes in direct wedge engagement with each other and infrictional engagement with respective columns, a spring compressedbetween the bolster and one of the shoes on a sloping compressional axisto prevent vertical chatter of said one shoe relative to the bolster,and means on the bolster for preventing vertical chatter of the othershoe relative to the bolster.

11. A railway car truck comprising a frame member with spaced columns, abolster therebetween, friction shoes housed in the bolster, said shoesbeing in direct wedge engagement with each other and being frictionallyengageable with respective columns, a sloping spring compressed betweenthe bolster and one shoe for urging the latter against the bolster andfor urging said shoes into said wedge engagement, and means on thebolster engageable with the other shoe for transmitting reaction of saidspring to said bolster.

' 12. A railway car truck, according to claim 11, wherein said meanscomprise a surface on the bolster between its top and bottom walls andengaged with a complementary surface of the said other shoe.

References Cited in the file of this patent UNITED STATES PATENTSHamilton Jan. 22,1952

